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Remove usage of AtomicIntegerFieldUpdater in ReferenceCountedOpenSslE… (#9653)

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Motivation:

There is not need to use a CAS as everything is synchronized anyway. We can simplify the code a bit by not using it.

Modifications:

- Just remove the CAS operation
- Change from int to boolean

Result:

Code cleanup
This commit is contained in:
Norman Maurer 2019-10-13 11:02:52 +02:00 committed by GitHub
parent deb34a0f8b
commit 833f11be75
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 9 deletions
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14
handler/src/main/java/io/netty/handler/ssl/ReferenceCountedOpenSslEngine.java
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@ -45,7 +45,6 @@ import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.locks.Lock;
import javax.crypto.spec.SecretKeySpec;
@ -124,9 +123,6 @@ public class ReferenceCountedOpenSslEngine extends SSLEngine implements Referenc
*/
private static final int MAX_RECORD_SIZE = SSL.SSL_MAX_RECORD_LENGTH;
private static final AtomicIntegerFieldUpdater<ReferenceCountedOpenSslEngine> DESTROYED_UPDATER =
AtomicIntegerFieldUpdater.newUpdater(ReferenceCountedOpenSslEngine.class, "destroyed");
private static final SSLEngineResult NEED_UNWRAP_OK = new SSLEngineResult(OK, NEED_UNWRAP, 0, 0);
private static final SSLEngineResult NEED_UNWRAP_CLOSED = new SSLEngineResult(CLOSED, NEED_UNWRAP, 0, 0);
private static final SSLEngineResult NEED_WRAP_OK = new SSLEngineResult(OK, NEED_WRAP, 0, 0);
@ -158,7 +154,7 @@ public class ReferenceCountedOpenSslEngine extends SSLEngine implements Referenc
private HandshakeState handshakeState = HandshakeState.NOT_STARTED;
private boolean receivedShutdown;
private volatile int destroyed;
private volatile boolean destroyed;
private volatile String applicationProtocol;
private volatile boolean needTask;
@ -360,8 +356,7 @@ public class ReferenceCountedOpenSslEngine extends SSLEngine implements Referenc
calculateMaxWrapOverhead();
} catch (Throwable cause) {
// Call shutdown so we are sure we correctly release all native memory and also guard against the
// case when shutdown() will be called by the finalizer again. If we would call SSL.free(...) directly
// the finalizer may end up calling it again as we would miss to update the DESTROYED_UPDATER.
// case when shutdown() will be called by the finalizer again.
shutdown();
PlatformDependent.throwException(cause);
@ -511,7 +506,8 @@ public class ReferenceCountedOpenSslEngine extends SSLEngine implements Referenc
* Destroys this engine.
*/
public final synchronized void shutdown() {
if (DESTROYED_UPDATER.compareAndSet(this, 0, 1)) {
if (!destroyed) {
destroyed = true;
engineMap.remove(ssl);
SSL.freeSSL(ssl);
ssl = networkBIO = 0;
@ -2025,7 +2021,7 @@ public class ReferenceCountedOpenSslEngine extends SSLEngine implements Referenc
}
private boolean isDestroyed() {
return destroyed != 0;
return destroyed;
}
final boolean checkSniHostnameMatch(byte[] hostname) {